Table 3 Ottawa-Newcastle scale of the included studies
Study | Selection | Comparability | Outcomes | Total 9/9 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Type of study Prospective/retrospective | Representative of the exposed cohort | Selection of non-exposed cohort | Ascertainment of exposure | Outcome of interest not present at the start of the study | Comparability of cohorts on the basis of the design or analysis controlled for confounders | Assessment of outcomes | Sufficient follow-up time | Adequacy of follow-up and cohorts | ||
Busweiler [1] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Priego [8] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Van der Kaaij [4] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Van der Werf [9] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Carbonell-Morote [3] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Dal Cero [10] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Sedłak [11] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Bolger [12] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Levy [14] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Roh [13] | Retrospective | * | * | * | * | */- | - | * | * | 7/9 |
Spolverato [7] | Retrospective | * | * | * | * | */- | - | - | - | 5/9 |
Cibulas [6] | Retrospective | * | * | * | * | */- | - | - | - | 5/9 |